Abstract
Set \({T=N^{\frac{1}{3}-\epsilon}}\). It is proved that for all but \({\ll TL^{-H},\,H > 0}\), exceptional prime numbers \({k\leq T}\) and almost all integers b 1, b 2 co-prime to k, almost all integers \({n\sim N}\) satisfying \({n\equiv b_{1}+b_{2}(mod\,k)}\) can be written as the sum of two primes p 1 and p 2 satisfying \({p_{i}\equiv b_{i}(mod\,k),\,i=1,2}\). For prime numbers \({k\leq N^{\frac{5}{24}-\epsilon}}\), this result is even true for all but \({\ll (\log\,N)^{D}}\) primes k and all integers b 1, b 2 co-prime to k.
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Bauer, C. Goldbach’s conjecture in arithmetic progressions: number and size of exceptional prime moduli. Arch. Math. 108, 159–172 (2017). https://doi.org/10.1007/s00013-016-0993-0
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DOI: https://doi.org/10.1007/s00013-016-0993-0